Adding a traceur_app domain to remove it from shell

This CL creates a traceur_app domain with userdebug privileges akin to
what shell has with regards to being able to find most services on
device. Previously, traceur was running as shell which was an
unintentional abuse of selinux architecture.

Bug: 68126425
Test: Traceur functions outside of shell user privilege
Change-Id: Ib5090e7e8225ad201b3ec24b506fe2717101d0f1